On Fri, Oct 24, 2014 at 12:12 AM, Michael S. Tsirkin <m...@redhat.com> wrote: > If a device appears while module is being removed, > driver will get a callback after we've given up > on the major number. > > In theory this means this major number can get reused > by something else, resulting in a conflict.
Yes, there is a tiny race window. > > To fix, cleanup in reverse order of initialization. Reviewed-by: Ming Lei <ming....@canonical.com> > Signed-off-by: Michael S. Tsirkin <m...@redhat.com> > --- > drivers/block/virtio_blk.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c > index 56aadbc..adfba9f 100644 > --- a/drivers/block/virtio_blk.c > +++ b/drivers/block/virtio_blk.c > @@ -883,8 +883,8 @@ out_destroy_workqueue: > > static void __exit fini(void) > { > - unregister_blkdev(major, "virtblk"); > unregister_virtio_driver(&virtio_blk); > + unregister_blkdev(major, "virtblk"); > destroy_workqueue(virtblk_wq); > } > module_init(init); Thanks, -- Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/